Atmosphere to Pound per Square Inch Formula
psi = atm x 14.6959
Conversion factors follow SI relationships published by BIPM and NIST, where those standards apply.
Atmosphere to Pound per Square Inch Converter
Quick Answer
1 atm = 14.6959 psi
Formula: Pound per Square Inch = Atmosphere x 14.6959
Quick values
Worked examples
Convert 1 atm to psi
psi = 1 x 14.6959
Result: 1 atm = 14.6959 psi
Convert 10 atm to psi
psi = 10 x 14.6959
Result: 10 atm = 146.959 psi
Convert 100 atm to psi
psi = 100 x 14.6959
Result: 100 atm = 1469.59 psi
About Atmosphere and Pound per Square Inch
Standard atmosphere (atm) is a conventional pressure of exactly 101,325 Pa. PSI is pound-force per square inch. 1 atm equals about 14.6959 psi — the familiar “14.7 psi” sea-level figure. This calculator uses the shared SI factors, not a rounded 14.7 shortcut.
Category hub: Pressure Conversion · Conversion charts · Conversion formulas
Atmosphere to Pound per Square Inch Conversion Table
| Atmosphere (atm) | Pound per Square Inch (psi) |
|---|---|
| 0.5 atm | 7.34797 psi |
| 1 atm | 14.6959 psi |
| 1.01325 atm | 14.8907 psi |
| 2 atm | 29.3919 psi |
| 5 atm | 73.4797 psi |
| 10 atm | 146.959 psi |
| 20 atm | 293.919 psi |
| 50 atm | 734.797 psi |
| 100 atm | 1469.59 psi |
Browse all conversion charts → · Browse conversion formulas →
Practical use cases for Atmosphere to Pound per Square Inch
Tire and Vehicle Service
Passenger-car tire placards in the US are often in PSI, while many gauges and shop manuals list kPa or bar. Converting before inflation avoids under- or over-pressurizing a tire.
HVAC and Hydronics
Boiler, chiller, and duct-pressure specs mix PSI, kPa, and inches of water. Field techs convert so setpoints match the equipment nameplate.
Process and Plant Engineering
P&IDs and relief-valve datasheets may use PSI, bar, or kPa depending on the region. Accurate conversion is required before sizing piping and safety devices.
Meteorology and Aviation
Altimeter and station-pressure reports use inHg, hPa, or kPa. Pilots and weather desks convert between those scales for briefings and QNH settings.
Medical and Laboratory Gases
Cylinder pressures and ventilator settings are published in different units by manufacturer and country. Clinicians convert to the unit on the local gauge.
Hydraulics and Pneumatics
Pump and compressor curves are often published in bar or kPa while US shop drawings stay in PSI. Converting keeps actuator force and regulator settings consistent.
Atmosphere to Pound per Square Inch FAQs
Common questions about converting atmosphere to pound per square inch.
How do you convert atmospheres to PSI?
Multiply atmospheres by 14.6959 (101,325 Pa ÷ 6,894.757 Pa). Example: 1 atm = 14.6959 psi, 2 atm = 29.3919 psi. Use the table for gauge-style values such as 30 psi tires (about 2.04 atm).
Is 1 atm exactly 14.7 psi?
No. 1 atm is 101,325 Pa and 1 psi is 6,894.757 Pa, so 1 atm = 14.6959 psi. 14.7 psi is a rounded estimate used in casual talk, not the value for lab or relief-valve work.
Does this convert gauge or absolute pressure?
The factor is the same for any reading already in atm or psi. 1 atm absolute is about 14.7 psia. A tire at 32 psig is 32 psi above local atmosphere, not 32 ÷ 14.7 atm of absolute pressure unless you add atmosphere first.
Where does the atmospheres to PSI factor come from?
Both units are defined against the pascal. NIST SP 811 and the BIPM SI Brochure publish those relationships. This page uses the site conversion library, not a live sensor.
Charts and printable PDF
Use the matching atmosphere / pound per square inch chart when you need a printable table or offline reference.
Embed this converter
Add this atm to psi calculator to another site with one async script or a lazy iframe. Keep the Powered by AllUnitConversions attribution so referrals stay canonical.
Docs: /embed?pair=atm-to-psi · iframe source: /widget